Screenshot is overwritten with new screenshot

Distribution

Linux Mint 21.3 Virginia

Package version

Cinnamon 6.0.4

Graphics hardware in use

Some cheap one

Frequency

Always

Bug description

When I open a new Screenshot (by using Alt+PrintScreen), apparently the screenshot information in other open instances gets overwritten. If I use Copy to Clipboard in the other instance(s), always the last screenshot will be copied. I tried to save the screenshot of an earlier instance, but could not find the file. I guess it is just not there anymore. Now I think of it: probably nothing gets copied as well from the earlier instance. I guess the screenshot has just gone.

Steps to reproduce

Just create a screenshot by pressing Alt+PrintScreen and the Screenshot window appears. Do this again to create another screenshot. Go back to the first instance and use the Copy to Clipboard or Save button. Paste the screenshot in Drawing or look for the file.

Expected behavior

I think each instance should keep its own screenshot safely and allow to copy it to the clipboard or save it as a file independently from what happens later. Imagine you create a new document in your word processor and all open documents are gone...

Additional information

If this is not the desired or expected behavior, the alternative would be to just show the screenshot has gone in the earlier instances. That would at least be correct feedback about the current state.

Start by reproducing the issue through the Alt+PrintScreen entry point: open two Screenshot instances, then use Copy to Clipboard and Save in the first. Done means each instance preserves its own screenshot independently, or clearly reports when its screenshot is unavailable.